Explanation

(c)
Ore Chemical composition
$Cuprite\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {Cu}_{2}O$
$Chalcocite\ \ \ \ \ \ \ \ \ \ \ {Cu}_{2}S$
$Chalcopyrite\ \ \ \ \ \ \ {CuFeS}_{2}$
$Malachite\ \ \ \ \ \ \ \ \ \ \ Cu(OH)_{2}.{CuCO}_{3}$
In these ores, chalcopyrite (${CuFeS}_{2}$) Contains both iron and copper.